... rate in500nm is less than 10%.With more than 70% far infrared transmissionThe purity of SiO2>99.9%Keep under 900°C ... in instant heating and the transmissivity of infrared is arrived to 70-75%2. Far infrared heating transmission, in medium wave, wave length ... . 6000h service life, with SGS, RoHs approved8. Widely used in infrared heater, cooking, oven, stove, baker, painting dryer, drying apparatus, ...